Symptom		Corrective Action		Remarks
12.	All handsets ring when aircraft is called.	1.	An aircall number is programmed into the aircraft register. Handsets you do not want to ring must be disabled.	At each handset you do not want to ring, Press "9" for set up at main menu. Press "+" for more followed by "the maintenance passcode, then "+" for OK. Press "4" for phone #, "2" for Aircalls, "+" for more, then "2" for NO. *NOTE: Only one station uplink number may be entered for each handset.
		2.	Program aircall numbers into the station register for each handset.
13.	Over time the voice audio starts to break up, gets static in back-ground. Calls drop intermittently.	1.	Most likely there is a problem with the RF cabling or an RF component, i.e., duplexer or Ant.	*NOTE: You should not be able to pull out or twist the coax cable when the connector is fully seated and tight. *NOTE: Center pin of SMA connectors must extend a minimum of .06" out from TEFLON.
		a)	Using alcohol and a Q-tip, clean and inspect all coax connector ends. Replace and tighten, cleaned connectors.
		b)	Ensure the tightness of all RF coax cable connectors. The BNC and TNC connectors connected to the front of the ARTU and the Type N connectors on the duplexer and antenna should be finger tight. (Do not use pliers of any kind to tighten these connectors.) Using a 5/16" open end wrench, ensure the tightness of the two SMA connectors on the duplexer.
		c)	) Inspect antenna for cracks, dents, or debonding from aircraft.